block.c

   1 /*
   2  * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
   3  * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU Lesser General Public License version 2.1
   7  * as published by the Free Software Foundation
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #define _GNU_SOURCE
  16 #include <getopt.h>
  17 #include <stdio.h>
  18 #include <unistd.h>
  19 #include <syslog.h>
  20 #include <libgen.h>
  21 #include <glob.h>
  22
  23 #include <sys/stat.h>
  24 #include <sys/types.h>
  25 #include <sys/swap.h>
  26 #include <sys/mount.h>
  27 #include <sys/wait.h>
  28
  29 #include <uci.h>
  30 #include <uci_blob.h>
  31
  32 #include <libubox/list.h>
  33 #include <libubox/vlist.h>
  34 #include <libubox/blobmsg_json.h>
  35 #include <libubox/avl-cmp.h>
  36
  37 #include "libblkid-tiny/libblkid-tiny.h"
  38
  39 #define ERROR(fmt, ...) do { \
  40                 syslog(LOG_ERR, fmt, ## __VA_ARGS__); \
  41                 fprintf(stderr, "block: "fmt, ## __VA_ARGS__); \
  42         } while (0)
  43
  44 enum {
  45         TYPE_MOUNT,
  46         TYPE_SWAP,
  47 };
  48
  49 struct mount {
  50         struct vlist_node node;
  51         int type;
  52
  53         char *target;
  54         char *path;
  55         char *options;
  56         uint32_t flags;
  57         char *uuid;
  58         char *label;
  59         char *device;
  60         int extroot;
  61         int overlay;
  62         int disabled_fsck;
  63         unsigned int prio;
  64 };
  65
  66 static struct vlist_tree mounts;
  67 static struct blob_buf b;
  68 static LIST_HEAD(devices);
  69 static int anon_mount, anon_swap, auto_mount, auto_swap, check_fs;
  70 static unsigned int delay_root;
  71
  72 enum {
  73         CFG_ANON_MOUNT,
  74         CFG_ANON_SWAP,
  75         CFG_AUTO_MOUNT,
  76         CFG_AUTO_SWAP,
  77         CFG_DELAY_ROOT,
  78         CFG_CHECK_FS,
  79         __CFG_MAX
  80 };
  81
  82 static const struct blobmsg_policy config_policy[__CFG_MAX] = {
  83         [CFG_ANON_SWAP] = { .name = "anon_swap", .type = BLOBMSG_TYPE_INT32 },
  84         [CFG_ANON_MOUNT] = { .name = "anon_mount", .type = BLOBMSG_TYPE_INT32 },
  85         [CFG_AUTO_SWAP] = { .name = "auto_swap", .type = BLOBMSG_TYPE_INT32 },
  86         [CFG_AUTO_MOUNT] = { .name = "auto_mount", .type = BLOBMSG_TYPE_INT32 },
  87         [CFG_DELAY_ROOT] = { .name = "delay_root", .type = BLOBMSG_TYPE_INT32 },
  88         [CFG_CHECK_FS] = { .name = "check_fs", .type = BLOBMSG_TYPE_INT32 },
  89 };
  90
  91 enum {
  92         MOUNT_UUID,
  93         MOUNT_LABEL,
  94         MOUNT_ENABLE,
  95         MOUNT_TARGET,
  96         MOUNT_DEVICE,
  97         MOUNT_OPTIONS,
  98         __MOUNT_MAX
  99 };
 100
 101 static const struct uci_blob_param_list config_attr_list = {
 102         .n_params = __CFG_MAX,
 103         .params = config_policy,
 104 };
 105
 106 static const struct blobmsg_policy mount_policy[__MOUNT_MAX] = {
 107         [MOUNT_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 108         [MOUNT_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 109         [MOUNT_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 110         [MOUNT_TARGET] = { .name = "target", .type = BLOBMSG_TYPE_STRING },
 111         [MOUNT_OPTIONS] = { .name = "options", .type = BLOBMSG_TYPE_STRING },
 112         [MOUNT_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 113 };
 114
 115 static const struct uci_blob_param_list mount_attr_list = {
 116         .n_params = __MOUNT_MAX,
 117         .params = mount_policy,
 118 };
 119
 120 enum {
 121         SWAP_ENABLE,
 122         SWAP_UUID,
 123         SWAP_LABEL,
 124         SWAP_DEVICE,
 125         SWAP_PRIO,
 126         __SWAP_MAX
 127 };
 128
 129 static const struct blobmsg_policy swap_policy[__SWAP_MAX] = {
 130         [SWAP_ENABLE] = { .name = "enabled", .type = BLOBMSG_TYPE_INT32 },
 131         [SWAP_UUID] = { .name = "uuid", .type = BLOBMSG_TYPE_STRING },
 132         [SWAP_LABEL] = { .name = "label", .type = BLOBMSG_TYPE_STRING },
 133         [SWAP_DEVICE] = { .name = "device", .type = BLOBMSG_TYPE_STRING },
 134         [SWAP_PRIO] = { .name = "priority", .type = BLOBMSG_TYPE_INT32 },
 135 };
 136
 137 static const struct uci_blob_param_list swap_attr_list = {
 138         .n_params = __SWAP_MAX,
 139         .params = swap_policy,
 140 };
 141
 142 struct mount_flag {
 143         const char *name;
 144         int32_t flag;
 145 };
 146
 147 #ifndef MS_DIRSYNC
 148 #       define MS_DIRSYNC               (1 << 7)
 149 #endif
 150
 151 #ifndef MS_RELATIME
 152 #       define MS_RELATIME              (1 << 21)
 153 #endif
 154
 155 #ifndef MS_STRICTATIME
 156 #       define MS_STRICTATIME   (1 << 24)
 157 #endif
 158
 159 static const struct mount_flag mount_flags[] = {
 160         { "sync",               MS_SYNCHRONOUS  },
 161         { "async",              ~MS_SYNCHRONOUS },
 162         { "dirsync",            MS_DIRSYNC      },
 163         { "mand",               MS_MANDLOCK     },
 164         { "nomand",             ~MS_MANDLOCK    },
 165         { "atime",              ~MS_NOATIME     },
 166         { "noatime",            MS_NOATIME      },
 167         { "dev",                ~MS_NODEV       },
 168         { "nodev",              MS_NODEV        },
 169         { "diratime",           ~MS_NODIRATIME  },
 170         { "nodiratime",         MS_NODIRATIME   },
 171         { "exec",               ~MS_NOEXEC      },
 172         { "noexec",             MS_NOEXEC       },
 173         { "suid",               ~MS_NOSUID      },
 174         { "nosuid",             MS_NOSUID       },
 175         { "rw",                 ~MS_RDONLY      },
 176         { "ro",                 MS_RDONLY       },
 177         { "relatime",           MS_RELATIME     },
 178         { "norelatime",         ~MS_RELATIME    },
 179         { "strictatime",        MS_STRICTATIME  },
 180 };
 181
 182 static char *blobmsg_get_strdup(struct blob_attr *attr)
 183 {
 184         if (!attr)
 185                 return NULL;
 186
 187         return strdup(blobmsg_get_string(attr));
 188 }
 189
 190 static char *blobmsg_get_basename(struct blob_attr *attr)
 191 {
 192         if (!attr)
 193                 return NULL;
 194
 195         return strdup(basename(blobmsg_get_string(attr)));
 196 }
 197
 198 static void parse_mount_options(struct mount *m, char *optstr)
 199 {
 200         int i;
 201         bool is_flag;
 202         char *p, *opts, *last;
 203
 204         m->flags = 0;
 205         m->options = NULL;
 206
 207         if (!optstr || !*optstr)
 208                 return;
 209
 210         m->options = opts = calloc(1, strlen(optstr) + 1);
 211
 212         if (!m->options)
 213                 return;
 214
 215         p = last = optstr;
 216
 217         do {
 218                 p = strchr(p, ',');
 219
 220                 if (p)
 221                         *p++ = 0;
 222
 223                 for (i = 0, is_flag = false; i < ARRAY_SIZE(mount_flags); i++) {
 224                         if (!strcmp(last, mount_flags[i].name)) {
 225                                 if (mount_flags[i].flag < 0)
 226                                         m->flags &= (uint32_t)mount_flags[i].flag;
 227                                 else
 228                                         m->flags |= (uint32_t)mount_flags[i].flag;
 229                                 is_flag = true;
 230                                 break;
 231                         }
 232                 }
 233
 234                 if (!is_flag)
 235                         opts += sprintf(opts, "%s%s", (opts > m->options) ? "," : "", last);
 236
 237                 last = p;
 238
 239         } while (p);
 240
 241         free(optstr);
 242 }
 243
 244 static int mount_add(struct uci_section *s)
 245 {
 246         struct blob_attr *tb[__MOUNT_MAX] = { 0 };
 247         struct mount *m;
 248
 249         blob_buf_init(&b, 0);
 250         uci_to_blob(&b, s, &mount_attr_list);
 251         blobmsg_parse(mount_policy, __MOUNT_MAX, tb, blob_data(b.head), blob_len(b.head));
 252
 253         if (!tb[MOUNT_LABEL] && !tb[MOUNT_UUID] && !tb[MOUNT_DEVICE])
 254                 return -1;
 255
 256         if (tb[MOUNT_ENABLE] && !blobmsg_get_u32(tb[MOUNT_ENABLE]))
 257                 return -1;
 258
 259         m = malloc(sizeof(struct mount));
 260         m->type = TYPE_MOUNT;
 261         m->uuid = blobmsg_get_strdup(tb[MOUNT_UUID]);
 262         m->label = blobmsg_get_strdup(tb[MOUNT_LABEL]);
 263         m->target = blobmsg_get_strdup(tb[MOUNT_TARGET]);
 264         m->device = blobmsg_get_basename(tb[MOUNT_DEVICE]);
 265
 266         parse_mount_options(m, blobmsg_get_strdup(tb[MOUNT_OPTIONS]));
 267
 268         m->overlay = m->extroot = 0;
 269         if (m->target && !strcmp(m->target, "/"))
 270                 m->extroot = 1;
 271         if (m->target && !strcmp(m->target, "/overlay"))
 272                 m->extroot = m->overlay = 1;
 273
 274         if (m->uuid)
 275                 vlist_add(&mounts, &m->node, m->uuid);
 276         else if (m->label)
 277                 vlist_add(&mounts, &m->node, m->label);
 278         else if (m->device)
 279                 vlist_add(&mounts, &m->node, m->device);
 280
 281         return 0;
 282 }
 283
 284 static int swap_add(struct uci_section *s)
 285 {
 286         struct blob_attr *tb[__SWAP_MAX] = { 0 };
 287         struct mount *m;
 288
 289         blob_buf_init(&b, 0);
 290         uci_to_blob(&b, s, &swap_attr_list);
 291         blobmsg_parse(swap_policy, __SWAP_MAX, tb, blob_data(b.head), blob_len(b.head));
 292
 293         if (!tb[SWAP_UUID] && !tb[SWAP_LABEL] && !tb[SWAP_DEVICE])
 294                 return -1;
 295
 296         m = malloc(sizeof(struct mount));
 297         memset(m, 0, sizeof(struct mount));
 298         m->type = TYPE_SWAP;
 299         m->uuid = blobmsg_get_strdup(tb[SWAP_UUID]);
 300         m->label = blobmsg_get_strdup(tb[SWAP_LABEL]);
 301         m->device = blobmsg_get_basename(tb[SWAP_DEVICE]);
 302         if (tb[SWAP_PRIO])
 303                 m->prio = blobmsg_get_u32(tb[SWAP_PRIO]);
 304         if (m->prio)
 305                 m->prio = ((m->prio << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
 306
 307         if ((!tb[SWAP_ENABLE]) || blobmsg_get_u32(tb[SWAP_ENABLE])) {
 308                 /* store complete swap path */
 309                 if (tb[SWAP_DEVICE])
 310                         m->target = blobmsg_get_strdup(tb[SWAP_DEVICE]);
 311
 312                 if (m->uuid)
 313                         vlist_add(&mounts, &m->node, m->uuid);
 314                 else if (m->label)
 315                         vlist_add(&mounts, &m->node, m->label);
 316                 else if (m->device)
 317                         vlist_add(&mounts, &m->node, m->device);
 318         }
 319
 320         return 0;
 321 }
 322
 323 static int global_add(struct uci_section *s)
 324 {
 325         struct blob_attr *tb[__CFG_MAX] = { 0 };
 326
 327         blob_buf_init(&b, 0);
 328         uci_to_blob(&b, s, &config_attr_list);
 329         blobmsg_parse(config_policy, __CFG_MAX, tb, blob_data(b.head), blob_len(b.head));
 330
 331         if ((tb[CFG_ANON_MOUNT]) && blobmsg_get_u32(tb[CFG_ANON_MOUNT]))
 332                 anon_mount = 1;
 333         if ((tb[CFG_ANON_SWAP]) && blobmsg_get_u32(tb[CFG_ANON_SWAP]))
 334                 anon_swap = 1;
 335
 336         if ((tb[CFG_AUTO_MOUNT]) && blobmsg_get_u32(tb[CFG_AUTO_MOUNT]))
 337                 auto_mount = 1;
 338         if ((tb[CFG_AUTO_SWAP]) && blobmsg_get_u32(tb[CFG_AUTO_SWAP]))
 339                 auto_swap = 1;
 340
 341         if (tb[CFG_DELAY_ROOT])
 342                 delay_root = blobmsg_get_u32(tb[CFG_DELAY_ROOT]);
 343
 344         if ((tb[CFG_CHECK_FS]) && blobmsg_get_u32(tb[CFG_CHECK_FS]))
 345                 check_fs = 1;
 346
 347         return 0;
 348 }
 349
 350 static struct mount* find_swap(const char *uuid, const char *label, const char *device)
 351 {
 352         struct mount *m;
 353
 354         vlist_for_each_element(&mounts, m, node) {
 355                 if (m->type != TYPE_SWAP)
 356                         continue;
 357                 if (uuid && m->uuid && !strcmp(m->uuid, uuid))
 358                         return m;
 359                 if (label && m->label && !strcmp(m->label, label))
 360                         return m;
 361                 if (device && m->device && !strcmp(m->device, device))
 362                         return m;
 363         }
 364
 365         return NULL;
 366 }
 367
 368 static struct mount* find_block(const char *uuid, const char *label, const char *device,
 369                                 const char *target)
 370 {
 371         struct mount *m;
 372
 373         vlist_for_each_element(&mounts, m, node) {
 374                 if (m->type != TYPE_MOUNT)
 375                         continue;
 376                 if (m->uuid && uuid && !strcmp(m->uuid, uuid))
 377                         return m;
 378                 if (m->label && label && !strcmp(m->label, label))
 379                         return m;
 380                 if (m->target && target && !strcmp(m->target, target))
 381                         return m;
 382                 if (m->device && device && !strcmp(m->device, device))
 383                         return m;
 384         }
 385
 386         return NULL;
 387 }
 388
 389 static void mounts_update(struct vlist_tree *tree, struct vlist_node *node_new,
 390                           struct vlist_node *node_old)
 391 {
 392 }
 393
 394 static int config_load(char *cfg)
 395 {
 396         struct uci_context *ctx;
 397         struct uci_package *pkg;
 398         struct uci_element *e;
 399
 400         vlist_init(&mounts, avl_strcmp, mounts_update);
 401
 402         ctx = uci_alloc_context();
 403         if (cfg) {
 404                 char path[32];
 405                 snprintf(path, 32, "%s/etc/config", cfg);
 406                 uci_set_confdir(ctx, path);
 407         }
 408
 409         if (uci_load(ctx, "fstab", &pkg))
 410         {
 411                 char *err;
 412                 uci_get_errorstr(ctx, &err, "fstab");
 413                 ERROR("extroot: failed to load %s/etc/config/%s\n",
 414                       cfg ? cfg : "", err);
 415                 free(err);
 416                 return -1;
 417         }
 418
 419         vlist_update(&mounts);
 420         uci_foreach_element(&pkg->sections, e) {
 421                 struct uci_section *s = uci_to_section(e);
 422
 423                 if (!strcmp(s->type, "mount"))
 424                         mount_add(s);
 425                 if (!strcmp(s->type, "swap"))
 426                         swap_add(s);
 427                 if (!strcmp(s->type, "global"))
 428                         global_add(s);
 429         }
 430         vlist_flush(&mounts);
 431
 432         return 0;
 433 }
 434
 435 static struct blkid_struct_probe* _probe_path(char *path)
 436 {
 437         struct blkid_struct_probe *pr;
 438
 439         pr = malloc(sizeof(*pr));
 440
 441         if (!pr)
 442                 return NULL;
 443
 444         memset(pr, 0, sizeof(*pr));
 445         probe_block(path, pr);
 446
 447         if (pr->err || !pr->id) {
 448                 free(pr);
 449                 return NULL;
 450         }
 451
 452         return pr;
 453 }
 454
 455 static int _cache_load(const char *path)
 456 {
 457         int gl_flags = GLOB_NOESCAPE | GLOB_MARK;
 458         int j;
 459         glob_t gl;
 460
 461         if (glob(path, gl_flags, NULL, &gl) < 0)
 462                 return -1;
 463
 464         for (j = 0; j < gl.gl_pathc; j++) {
 465                 struct blkid_struct_probe *pr = _probe_path(gl.gl_pathv[j]);
 466                 if (pr)
 467                         list_add_tail(&pr->list, &devices);
 468         }
 469
 470         globfree(&gl);
 471
 472         return 0;
 473 }
 474
 475 static void cache_load(int mtd)
 476 {
 477         if (mtd) {
 478                 _cache_load("/dev/mtdblock*");
 479                 _cache_load("/dev/ubiblock*");
 480         }
 481         _cache_load("/dev/mmcblk*");
 482         _cache_load("/dev/sd*");
 483         _cache_load("/dev/hd*");
 484         _cache_load("/dev/md*");
 485         _cache_load("/dev/mapper/*");
 486 }
 487
 488 static int print_block_info(struct blkid_struct_probe *pr)
 489 {
 490         printf("%s:", pr->dev);
 491         if (pr->uuid[0])
 492                 printf(" UUID=\"%s\"", pr->uuid);
 493
 494         if (pr->label[0])
 495                 printf(" LABEL=\"%s\"", pr->label);
 496
 497         if (pr->name[0])
 498                 printf(" NAME=\"%s\"", pr->name);
 499
 500         if (pr->version[0])
 501                 printf(" VERSION=\"%s\"", pr->version);
 502
 503         printf(" TYPE=\"%s\"\n", pr->id->name);
 504
 505         return 0;
 506 }
 507
 508 static int print_block_uci(struct blkid_struct_probe *pr)
 509 {
 510         if (!strcmp(pr->id->name, "swap")) {
 511                 printf("config 'swap'\n");
 512         } else {
 513                 printf("config 'mount'\n");
 514                 printf("\toption\ttarget\t'/mnt/%s'\n", basename(pr->dev));
 515         }
 516         if (pr->uuid[0])
 517                 printf("\toption\tuuid\t'%s'\n", pr->uuid);
 518         else
 519                 printf("\toption\tdevice\t'%s'\n", pr->dev);
 520         printf("\toption\tenabled\t'0'\n\n");
 521
 522         return 0;
 523 }
 524
 525 static struct blkid_struct_probe* find_block_info(char *uuid, char *label, char *path)
 526 {
 527         struct blkid_struct_probe *pr = NULL;
 528
 529         if (uuid)
 530                 list_for_each_entry(pr, &devices, list)
 531                         if (!strcmp(pr->uuid, uuid))
 532                                 return pr;
 533
 534         if (label)
 535                 list_for_each_entry(pr, &devices, list)
 536                         if (!strcmp(pr->label, label))
 537                                 return pr;
 538
 539         if (path)
 540                 list_for_each_entry(pr, &devices, list)
 541                         if (!strcmp(basename(pr->dev), basename(path)))
 542                                 return pr;
 543
 544         return NULL;
 545 }
 546
 547 static char* find_mount_point(char *block)
 548 {
 549         FILE *fp = fopen("/proc/mounts", "r");
 550         static char line[256];
 551         int len = strlen(block);
 552         char *point = NULL;
 553
 554         if(!fp)
 555                 return NULL;
 556
 557         while (fgets(line, sizeof(line), fp)) {
 558                 if (!strncmp(line, block, len)) {
 559                         char *p = &line[len + 1];
 560                         char *t = strstr(p, " ");
 561
 562                         if (!t) {
 563                                 fclose(fp);
 564                                 return NULL;
 565                         }
 566                         *t = '\0';
 567                         point = p;
 568                         break;
 569                 }
 570         }
 571
 572         fclose(fp);
 573
 574         return point;
 575 }
 576
 577 static void mkdir_p(char *dir)
 578 {
 579         char *l = strrchr(dir, '/');
 580
 581         if (l) {
 582                 *l = '\0';
 583                 mkdir_p(dir);
 584                 *l = '/';
 585                 mkdir(dir, 0755);
 586         }
 587 }
 588
 589 static void check_filesystem(struct blkid_struct_probe *pr)
 590 {
 591         pid_t pid;
 592         struct stat statbuf;
 593         char *e2fsck = "/usr/sbin/e2fsck";
 594
 595         if (strncmp(pr->id->name, "ext", 3)) {
 596                 ERROR("check_filesystem: %s is not supported\n", pr->id->name);
 597                 return;
 598         }
 599
 600         if (stat(e2fsck, &statbuf) < 0) {
 601                 ERROR("check_filesystem: %s not found\n", e2fsck);
 602                 return;
 603         }
 604
 605         pid = fork();
 606         if (!pid) {
 607                 execl(e2fsck, e2fsck, "-p", pr->dev, NULL);
 608                 exit(-1);
 609         } else if (pid > 0) {
 610                 int status;
 611
 612                 waitpid(pid, &status, 0);
 613                 if (WEXITSTATUS(status))
 614                         ERROR("check_filesystem: %s returned %d\n", e2fsck, WEXITSTATUS(status));
 615         }
 616 }
 617
 618 static void handle_swapfiles(bool on)
 619 {
 620         struct stat s;
 621         struct mount *m;
 622         struct blkid_struct_probe *pr;
 623
 624         vlist_for_each_element(&mounts, m, node)
 625         {
 626                 if (m->type != TYPE_SWAP || !m->target)
 627                         continue;
 628
 629                 if (stat(m->target, &s) || !S_ISREG(s.st_mode))
 630                         continue;
 631
 632                 pr = _probe_path(m->target);
 633
 634                 if (!pr)
 635                         continue;
 636
 637                 if (!strcmp(pr->id->name, "swap")) {
 638                         if (on)
 639                                 swapon(pr->dev, m->prio);
 640                         else
 641                                 swapoff(pr->dev);
 642                 }
 643
 644                 free(pr);
 645         }
 646 }
 647
 648 static int mount_device(struct blkid_struct_probe *pr, int hotplug)
 649 {
 650         struct mount *m;
 651         char *device;
 652
 653         if (!pr)
 654                 return -1;
 655
 656         device = basename(pr->dev);
 657
 658         if (!strcmp(pr->id->name, "swap")) {
 659                 if (hotplug && !auto_swap)
 660                         return -1;
 661                 m = find_swap(pr->uuid, pr->label, device);
 662                 if (m || anon_swap)
 663                         swapon(pr->dev, (m) ? (m->prio) : (0));
 664
 665                 return 0;
 666         }
 667
 668         if (hotplug && !auto_mount)
 669                 return -1;
 670
 671         if (find_mount_point(pr->dev)) {
 672                 ERROR("%s is already mounted\n", pr->dev);
 673                 return -1;
 674         }
 675
 676         m = find_block(pr->uuid, pr->label, device, NULL);
 677         if (m && m->extroot)
 678                 return -1;
 679
 680         if (m) {
 681                 char *target = m->target;
 682                 char _target[32];
 683                 int err = 0;
 684
 685                 if (!target) {
 686                         snprintf(_target, sizeof(_target), "/mnt/%s", device);
 687                         target = _target;
 688                 }
 689                 mkdir_p(target);
 690
 691                 if (check_fs)
 692                         check_filesystem(pr);
 693
 694                 err = mount(pr->dev, target, pr->id->name, m->flags,
 695                             (m->options) ? (m->options) : (""));
 696                 if (err)
 697                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 698                                         pr->dev, pr->id->name, target, err, strerror(err));
 699                 else
 700                         handle_swapfiles(true);
 701                 return err;
 702         }
 703
 704         if (anon_mount) {
 705                 char target[] = "/mnt/mmcblk123";
 706                 int err = 0;
 707
 708                 snprintf(target, sizeof(target), "/mnt/%s", device);
 709                 mkdir_p(target);
 710
 711                 if (check_fs)
 712                         check_filesystem(pr);
 713
 714                 err = mount(pr->dev, target, pr->id->name, 0, "");
 715                 if (err)
 716                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 717                                         pr->dev, pr->id->name, target, err, strerror(err));
 718                 else
 719                         handle_swapfiles(true);
 720                 return err;
 721         }
 722
 723         return 0;
 724 }
 725
 726 static int umount_device(struct blkid_struct_probe *pr)
 727 {
 728         struct mount *m;
 729         char *device = basename(pr->dev);
 730         char *mp;
 731         int err;
 732
 733         if (!pr)
 734                 return -1;
 735
 736         if (!strcmp(pr->id->name, "swap"))
 737                 return -1;
 738
 739         mp = find_mount_point(pr->dev);
 740         if (!mp)
 741                 return -1;
 742
 743         m = find_block(pr->uuid, pr->label, device, NULL);
 744         if (m && m->extroot)
 745                 return -1;
 746
 747         err = umount2(mp, MNT_DETACH);
 748         if (err)
 749                 ERROR("unmounting %s (%s)  failed (%d) - %s\n",
 750                         pr->dev, mp, err, strerror(err));
 751         else
 752                 ERROR("unmounted %s (%s)\n",
 753                         pr->dev, mp);
 754
 755         return err;
 756 }
 757
 758 static int main_hotplug(int argc, char **argv)
 759 {
 760         char path[32];
 761         char *action, *device, *mount_point;
 762
 763         action = getenv("ACTION");
 764         device = getenv("DEVNAME");
 765
 766         if (!action || !device)
 767                 return -1;
 768         snprintf(path, sizeof(path), "/dev/%s", device);
 769
 770         if (!strcmp(action, "remove")) {
 771                 int err = 0;
 772                 mount_point = find_mount_point(path);
 773                 if (mount_point)
 774                         err = umount2(mount_point, MNT_DETACH);
 775
 776                 if (err)
 777                         ERROR("umount of %s failed (%d) - %s\n",
 778                                         mount_point, err, strerror(err));
 779
 780                 return 0;
 781         } else if (strcmp(action, "add")) {
 782                 ERROR("Unkown action %s\n", action);
 783
 784                 return -1;
 785         }
 786
 787         if (config_load(NULL))
 788                 return -1;
 789         cache_load(0);
 790
 791         return mount_device(find_block_info(NULL, NULL, path), 1);
 792 }
 793
 794 static int find_block_mtd(char *name, char *part, int plen)
 795 {
 796         FILE *fp = fopen("/proc/mtd", "r");
 797         static char line[256];
 798         char *index = NULL;
 799
 800         if(!fp)
 801                 return -1;
 802
 803         while (!index && fgets(line, sizeof(line), fp)) {
 804                 if (strstr(line, name)) {
 805                         char *eol = strstr(line, ":");
 806
 807                         if (!eol)
 808                                 continue;
 809
 810                         *eol = '\0';
 811                         index = &line[3];
 812                 }
 813         }
 814
 815         fclose(fp);
 816
 817         if (!index)
 818                 return -1;
 819
 820         snprintf(part, plen, "/dev/mtdblock%s", index);
 821
 822         return 0;
 823 }
 824
 825 static int check_extroot(char *path)
 826 {
 827         struct blkid_struct_probe *pr = NULL;
 828         char fs[32];
 829
 830         if (find_block_mtd("rootfs", fs, sizeof(fs)))
 831                 return -1;
 832
 833         list_for_each_entry(pr, &devices, list) {
 834                 if (!strcmp(pr->dev, fs)) {
 835                         struct stat s;
 836                         FILE *fp = NULL;
 837                         char tag[64];
 838                         char uuid[64] = { 0 };
 839
 840                         snprintf(tag, sizeof(tag), "%s/etc/.extroot-uuid", path);
 841                         if (stat(tag, &s)) {
 842                                 fp = fopen(tag, "w+");
 843                                 if (!fp) {
 844                                         ERROR("extroot: failed to write uuid tag file\n");
 845                                         /* return 0 to continue boot regardless of error */
 846                                         return 0;
 847                                 }
 848                                 fputs(pr->uuid, fp);
 849                                 fclose(fp);
 850                                 return 0;
 851                         }
 852
 853                         fp = fopen(tag, "r");
 854                         if (!fp) {
 855                                 ERROR("extroot: failed to open uuid tag file\n");
 856                                 return -1;
 857                         }
 858
 859                         fgets(uuid, sizeof(uuid), fp);
 860                         fclose(fp);
 861                         if (!strcmp(uuid, pr->uuid))
 862                                 return 0;
 863                         ERROR("extroot: uuid tag does not match rom uuid\n");
 864                 }
 865         }
 866         return -1;
 867 }
 868
 869 static int mount_extroot(char *cfg)
 870 {
 871         char overlay[] = "/tmp/extroot/overlay";
 872         char mnt[] = "/tmp/extroot/mnt";
 873         char *path = mnt;
 874         struct blkid_struct_probe *pr;
 875         struct mount *m;
 876         int err = -1;
 877
 878         if (config_load(cfg))
 879                 return -2;
 880
 881         m = find_block(NULL, NULL, NULL, "/");
 882         if (!m)
 883                 m = find_block(NULL, NULL, NULL, "/overlay");
 884
 885         if (!m || !m->extroot)
 886         {
 887                 ERROR("extroot: no root or overlay mount defined\n");
 888                 return -1;
 889         }
 890
 891         pr = find_block_info(m->uuid, m->label, m->device);
 892
 893         if (!pr && delay_root){
 894                 ERROR("extroot: is not ready yet, retrying in %u seconds\n", delay_root);
 895                 sleep(delay_root);
 896                 mkblkdev();
 897                 cache_load(0);
 898                 pr = find_block_info(m->uuid, m->label, m->device);
 899         }
 900         if (pr) {
 901                 if (strncmp(pr->id->name, "ext", 3)) {
 902                         ERROR("extroot: %s is not supported, try ext4\n", pr->id->name);
 903                         return -1;
 904                 }
 905                 if (m->overlay)
 906                         path = overlay;
 907                 mkdir_p(path);
 908
 909                 if (check_fs)
 910                         check_filesystem(pr);
 911
 912                 err = mount(pr->dev, path, pr->id->name, 0, (m->options) ? (m->options) : (""));
 913
 914                 if (err) {
 915                         ERROR("mounting %s (%s) as %s failed (%d) - %s\n",
 916                                         pr->dev, pr->id->name, path, err, strerror(err));
 917                 } else if (m->overlay) {
 918                         err = check_extroot(path);
 919                         if (err)
 920                                 umount(path);
 921                 }
 922         } else {
 923                 ERROR("extroot: cannot find block device\n");
 924         }
 925
 926         return err;
 927 }
 928
 929 static int main_extroot(int argc, char **argv)
 930 {
 931         struct blkid_struct_probe *pr;
 932         char fs[32] = { 0 };
 933         char fs_data[32] = { 0 };
 934         int err = -1;
 935
 936         if (!getenv("PREINIT"))
 937                 return -1;
 938
 939         if (argc != 2) {
 940                 fprintf(stderr, "Usage: block extroot mountpoint\n");
 941                 return -1;
 942         }
 943
 944         mkblkdev();
 945         cache_load(1);
 946
 947         find_block_mtd("rootfs", fs, sizeof(fs));
 948         if (!fs[0]) {
 949                 ERROR("extroot: unable to locate rootfs mtdblock\n");
 950                 return -2;
 951         }
 952
 953         pr = find_block_info(NULL, NULL, fs);
 954         if (!pr) {
 955                 ERROR("extroot: unable to retrieve rootfs information\n");
 956                 return -3;
 957         }
 958
 959         find_block_mtd("rootfs_data", fs_data, sizeof(fs_data));
 960         if (fs_data[0]) {
 961                 pr = find_block_info(NULL, NULL, fs_data);
 962                 if (pr && !strcmp(pr->id->name, "jffs2")) {
 963                         char cfg[] = "/tmp/jffs_cfg";
 964
 965                         mkdir_p(cfg);
 966                         if (!mount(fs_data, cfg, "jffs2", MS_NOATIME, NULL)) {
 967                                 err = mount_extroot(cfg);
 968                                 umount2(cfg, MNT_DETACH);
 969                         }
 970                         if (err < 0)
 971                                 rmdir("/tmp/overlay");
 972                         rmdir(cfg);
 973                         return err;
 974                 }
 975         }
 976
 977         return mount_extroot(NULL);
 978 }
 979
 980 static int main_mount(int argc, char **argv)
 981 {
 982         struct blkid_struct_probe *pr;
 983
 984         if (config_load(NULL))
 985                 return -1;
 986
 987         cache_load(1);
 988         list_for_each_entry(pr, &devices, list)
 989                 mount_device(pr, 0);
 990
 991         handle_swapfiles(true);
 992
 993         return 0;
 994 }
 995
 996 static int main_umount(int argc, char **argv)
 997 {
 998         struct blkid_struct_probe *pr;
 999
1000         if (config_load(NULL))
1001                 return -1;
1002
1003         handle_swapfiles(false);
1004
1005         cache_load(0);
1006         list_for_each_entry(pr, &devices, list)
1007                 umount_device(pr);
1008
1009         return 0;
1010 }
1011
1012 static int main_detect(int argc, char **argv)
1013 {
1014         struct blkid_struct_probe *pr;
1015
1016         cache_load(0);
1017         printf("config 'global'\n");
1018         printf("\toption\tanon_swap\t'0'\n");
1019         printf("\toption\tanon_mount\t'0'\n");
1020         printf("\toption\tauto_swap\t'1'\n");
1021         printf("\toption\tauto_mount\t'1'\n");
1022         printf("\toption\tdelay_root\t'5'\n");
1023         printf("\toption\tcheck_fs\t'0'\n\n");
1024         list_for_each_entry(pr, &devices, list)
1025                 print_block_uci(pr);
1026
1027         return 0;
1028 }
1029
1030 static int main_info(int argc, char **argv)
1031 {
1032         int i;
1033         struct blkid_struct_probe *pr;
1034
1035         cache_load(1);
1036         if (argc == 2) {
1037                 list_for_each_entry(pr, &devices, list)
1038                         print_block_info(pr);
1039
1040                 return 0;
1041         };
1042
1043         for (i = 2; i < argc; i++) {
1044                 struct stat s;
1045
1046                 if (stat(argv[i], &s)) {
1047                         ERROR("failed to stat %s\n", argv[i]);
1048                         continue;
1049                 }
1050                 if (!S_ISBLK(s.st_mode)) {
1051                         ERROR("%s is not a block device\n", argv[i]);
1052                         continue;
1053                 }
1054                 pr = find_block_info(NULL, NULL, argv[i]);
1055                 if (pr)
1056                         print_block_info(pr);
1057         }
1058
1059         return 0;
1060 }
1061
1062 static int swapon_usage(void)
1063 {
1064         fprintf(stderr, "Usage: swapon [-s] [-a] [[-p pri] DEVICE]\n\n"
1065                 "\tStart swapping on [DEVICE]\n"
1066                 " -a\tStart swapping on all swap devices\n"
1067                 " -p pri\tSet priority of swap device\n"
1068                 " -s\tShow summary\n");
1069         return -1;
1070 }
1071
1072 static int main_swapon(int argc, char **argv)
1073 {
1074         int ch;
1075         FILE *fp;
1076         char *lineptr;
1077         size_t s;
1078         struct blkid_struct_probe *pr;
1079         int flags = 0;
1080         int pri;
1081         struct stat st;
1082         int err;
1083
1084         while ((ch = getopt(argc, argv, "ap:s")) != -1) {
1085                 switch(ch) {
1086                 case 's':
1087                         fp = fopen("/proc/swaps", "r");
1088                         lineptr = NULL;
1089
1090                         if (!fp) {
1091                                 ERROR("failed to open /proc/swaps\n");
1092                                 return -1;
1093                         }
1094                         while (getline(&lineptr, &s, fp) > 0)
1095                                 printf(lineptr);
1096                         if (lineptr)
1097                                 free(lineptr);
1098                         fclose(fp);
1099                         return 0;
1100                 case 'a':
1101                         cache_load(0);
1102                         list_for_each_entry(pr, &devices, list) {
1103                                 if (strcmp(pr->id->name, "swap"))
1104                                         continue;
1105                                 if (swapon(pr->dev, 0))
1106                                         ERROR("failed to swapon %s\n", pr->dev);
1107                         }
1108                         return 0;
1109                 case 'p':
1110                         pri = atoi(optarg);
1111                         if (pri >= 0)
1112                                 flags = ((pri << SWAP_FLAG_PRIO_SHIFT) & SWAP_FLAG_PRIO_MASK) | SWAP_FLAG_PREFER;
1113                         break;
1114                 default:
1115                         return swapon_usage();
1116                 }
1117
1118         }
1119
1120         if (optind != (argc - 1))
1121                 return swapon_usage();
1122
1123         if (stat(argv[optind], &st) || (!S_ISBLK(st.st_mode) && !S_ISREG(st.st_mode))) {
1124                 ERROR("%s is not a block device or file\n", argv[optind]);
1125                 return -1;
1126         }
1127         err = swapon(argv[optind], flags);
1128         if (err) {
1129                 ERROR("failed to swapon %s (%d)\n", argv[optind], err);
1130                 return err;
1131         }
1132
1133         return 0;
1134 }
1135
1136 static int main_swapoff(int argc, char **argv)
1137 {
1138         if (argc != 2) {
1139                 ERROR("Usage: swapoff [-a] [DEVICE]\n\n"
1140                         "\tStop swapping on DEVICE\n"
1141                         " -a\tStop swapping on all swap devices\n");
1142                 return -1;
1143         }
1144
1145         if (!strcmp(argv[1], "-a")) {
1146                 FILE *fp = fopen("/proc/swaps", "r");
1147                 char line[256];
1148
1149                 if (!fp) {
1150                         ERROR("failed to open /proc/swaps\n");
1151                         return -1;
1152                 }
1153                 fgets(line, sizeof(line), fp);
1154                 while (fgets(line, sizeof(line), fp)) {
1155                         char *end = strchr(line, ' ');
1156                         int err;
1157
1158                         if (!end)
1159                                 continue;
1160                         *end = '\0';
1161                         err = swapoff(line);
1162                         if (err)
1163                                 ERROR("failed to swapoff %s (%d)\n", line, err);
1164                 }
1165                 fclose(fp);
1166         } else {
1167                 struct stat s;
1168                 int err;
1169
1170                 if (stat(argv[1], &s) || (!S_ISBLK(s.st_mode) && !S_ISREG(s.st_mode))) {
1171                         ERROR("%s is not a block device or file\n", argv[1]);
1172                         return -1;
1173                 }
1174                 err = swapoff(argv[1]);
1175                 if (err) {
1176                         ERROR("fsiled to swapoff %s (%d)\n", argv[1], err);
1177                         return err;
1178                 }
1179         }
1180
1181         return 0;
1182 }
1183
1184 int main(int argc, char **argv)
1185 {
1186         char *base = basename(*argv);
1187
1188         umask(0);
1189
1190         if (!strcmp(base, "swapon"))
1191                 return main_swapon(argc, argv);
1192
1193         if (!strcmp(base, "swapoff"))
1194                 return main_swapoff(argc, argv);
1195
1196         if ((argc > 1) && !strcmp(base, "block")) {
1197                 if (!strcmp(argv[1], "info"))
1198                         return main_info(argc, argv);
1199
1200                 if (!strcmp(argv[1], "detect"))
1201                         return main_detect(argc, argv);
1202
1203                 if (!strcmp(argv[1], "hotplug"))
1204                         return main_hotplug(argc, argv);
1205
1206                 if (!strcmp(argv[1], "extroot"))
1207                         return main_extroot(argc, argv);
1208
1209                 if (!strcmp(argv[1], "mount"))
1210                         return main_mount(argc, argv);
1211
1212                 if (!strcmp(argv[1], "umount"))
1213                         return main_umount(argc, argv);
1214         }
1215
1216         fprintf(stderr, "Usage: block <info|mount|umount|detect>\n");
1217
1218         return -1;
1219 }